CVE-2023-22920 : What You Need to Know

This CVE record was published on February 21, 2023, by Zyxel. It addresses a security misconfiguration vulnerability found in the Zyxel LTE3316-M604 firmware version V2.00(ABMP.6)C0. The vulnerability stems from a factory default misconfiguration that was intended for testing purposes. Exploiting this vulnerability could allow a remote attacker to access an affected device using Telnet.

Understanding CVE-2023-22920

This section will delve into the specifics of CVE-2023-22920, its impact, technical details, and mitigation strategies.

What is CVE-2023-22920?

CVE-2023-22920 is a security misconfiguration vulnerability present in the Zyxel LTE3316-M604 firmware version V2.00(ABMP.6)C0. It allows remote attackers to access the affected device through Telnet due to the default misconfiguration set for testing purposes.

The Impact of CVE-2023-22920

With a CVSS v3.1 base score of 9.8 (Critical), this vulnerability poses a high risk. Attackers can exploit it to gain unauthorized access to devices, potentially leading to data breaches, system integrity compromise, and service disruptions.

Technical Details of CVE-2023-22920

Understanding the technical aspects of CVE-2023-22920 is crucial for effective vulnerability management.

Vulnerability Description

The vulnerability arises from a security misconfiguration in the Zyxel LTE3316-M604 firmware version V2.00(ABMP.6)C0, allowing remote attackers to exploit Telnet access.

Affected Systems and Versions

The Zyxel LTE3316-M604 firmware version V2.00(ABMP.6)C0 is impacted by this vulnerability.

Exploitation Mechanism

By leveraging the misconfigured default settings meant for testing purposes, remote attackers can gain access to vulnerable devices via Telnet.

Mitigation and Prevention

Addressing CVE-2023-22920 promptly and implementing security measures can help mitigate risks and safeguard systems.

Immediate Steps to Take

Disable Telnet access if not required.
Update the Zyxel LTE3316-M604 firmware to a patched version to address the misconfiguration vulnerability.

Long-Term Security Practices

Regularly monitor security advisories from Zyxel and apply patches promptly.
Implement network segmentation to limit the exposure of vulnerable devices.

Patching and Updates

Ensure that the Zyxel LTE3316-M604 firmware is regularly updated to the latest version available, containing fixes for known vulnerabilities and misconfigurations.